16129
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 3
- Divisor Sum
- 16257
- Proper Divisor Sum (Aliquot Sum)
- 128
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16002
- Möbius Function
- 0
- Radical
- 127
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 1
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- yes
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 71
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- no
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Squares of primes.at n=30A001248
- Numbers m such that phi(m) * sigma(m) + k^2 is not a square for any k.at n=38A015713
- a(n) = (3*n+1)^2.at n=42A016778
- a(n) = (4n + 3)^2.at n=31A016838
- a(n) = (5*n + 2)^2.at n=25A016874
- a(n) = (6*n + 1)^2.at n=21A016922
- a(n) = (7*n + 1)^2.at n=18A016994
- a(n) = (8*n + 7)^2.at n=15A017150
- a(n) = (9*n + 1)^2.at n=14A017174
- a(n) = (10*n + 7)^2.at n=12A017354
- a(n) = (11*n + 6)^2.at n=11A017462
- a(n) = (12*n + 7)^2.at n=10A017606
- Strong pseudoprimes to base 38.at n=17A020264
- Strong pseudoprimes to base 62.at n=21A020288
- Sum of distinct prime divisors of p(n)*p(n-1) + 1.at n=54A023529
- a(n) = A024727(n+3)/4.at n=14A024728
- Squares-of-primes in which no two adjacent digits have the same parity.at n=10A030146
- Squares in which parity of digits alternates.at n=26A030152
- Squares such that in n and sqrt(n) the parity of digits alternates.at n=17A030154
- Odd squares in which parity of digits alternates.at n=16A030156